BorgWarner EFR Stiff Blow Off Valve Spring
BorgWarner EFR Stiff Blow Off Valve Spring
BorgWarner EFR Stiff Blow Off Valve Spring
BorgWarner EFR Stiff Blow Off Valve Spring
Borg Warner’s alternate “stiff” CRV spring for the EFR turbochargers provides a 66% stiffer spring rate than the standard EFR spring. Designed to meet the needs of those who require a bit more clamping force at the BOV, this is the stiffest spring suitable for use with the EFR internal BOV. (Any higher stiffness than this leads to tip-out surge when lifting from part throttle).
Comparison: EFR Standard Spring (Left) Vs EFR Stiff Spring (Right)
Note: This item is not required based on HP or boost level – most applications work fine with the standard CRV spring. For applications that have an open CRV during part throttle cruising in high vacuum (Audibly loud, such as stock engine Subaru WRX/STI with EFR6758) or if surge is present while lifting the throttle – this stiffer spring may be the solution.
SKU
58061191364
WEIGHT
1.000000
BRAND
BorgWarner
Universal Installation Parts
T3 T4 Oil Feed Flange
T3 Turbine Flange Gasket
2.5" 45 Degree Coupler Extra Long
Full-Race 304 Stainless Steel 3" V-Band Flange Kit
4" V-band Flange Kit
Full-Race 304 Stainless Steel 4" V-band Flanges
T4 Open Turbine Flange
Full-Race T4 Divided 5 Layer Inconel Gasket
Large GT/GTX Oil Drain Flange
10mm M10 Inconel Turbo Stud Hardware Kit T3 T4 Turbos
4 Bolt Downpipe Turbine Flange For GT, GTX and T3/T4 Garrett Turbos
Silicone 4" 45 Degree Intake Elbow / Coupler
Full-Race Billet Medium GT Oil Drain Flange (1/2" NPT)
T4 Divided Turbine Flange
3" V-Band Flanges
T3 Open Turbine Flange
2.5" Silicone Hump Hose
Full-Race Billet Vacuum / Boost Reference Manifold Block
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